// 打印类属性、方法定义
/* eslint-disable */
const Print = function (dom, options) {
    if (!(this instanceof Print)) return new Print(dom, options);
	this.options = this.extend({
		'noPrint': '.no-print'
	}, options);
    if ((typeof dom) === "string") {
      	this.dom = document.querySelector(dom);
    } else {
		this.isDOM(dom);
		this.dom = this.isDOM(dom) ? dom : dom.$el;
    }
    this.init();
};
Print.prototype = {
    init: function () {
		var content = this.getStyle() + this.getHtml();
		this.writeIframe(content);
    },
    extend: function (obj, obj2) {
		for (var k in obj2) {
			obj[k] = obj2[k];
		}
		return obj;
    },
    getStyle: function () {
		var str = "",
			styles = document.querySelectorAll('style,link');
		for (var i = 0; i < styles.length; i++) {
			str += styles[i].outerHTML;
		}
		str += "<style>" + (this.options.noPrint ? this.options.noPrint : '.no-print') + "{display:none;}; </style>";
		return str;
    },
    getHtml: function () {
		var inputs = document.querySelectorAll('input');
		var textareas = document.querySelectorAll('textarea');
		var selects = document.querySelectorAll('select');
		for (var k = 0; k < inputs.length; k++) {
			if (inputs[k].type == "checkbox" || inputs[k].type == "radio") {
				if (inputs[k].checked == true) {
					inputs[k].setAttribute('checked', "checked")
				} else {
					inputs[k].removeAttribute('checked')
				}
			} else if (inputs[k].type == "text") {
				inputs[k].setAttribute('value', inputs[k].value)
			} else {
				inputs[k].setAttribute('value', inputs[k].value)
			}
		}
		for (var k2 = 0; k2 < textareas.length; k2++) {
			if (textareas[k2].type == 'textarea') {
				textareas[k2].innerHTML = textareas[k2].value
			}
		}
		for (var k3 = 0; k3 < selects.length; k3++) {
			if (selects[k3].type == 'select-one') {
				var child = selects[k3].children;
				for (var i in child) {
					if (child[i].tagName == 'OPTION') {
						if (child[i].selected == true) {
							child[i].setAttribute('selected', "selected")
						} else {
							child[i].removeAttribute('selected')
						}
					}
				}
			}
      	}
		// 包裹要打印的元素
		// fix: https://github.com/xyl66/vuePlugs_printjs/issues/36
		let outerHTML = this.dom.innerHTML;
		return outerHTML;
    },
    // 向父级元素循环，包裹当前需要打印的元素
    // 防止根级别开头的 css 选择器不生效
    wrapperRefDom: function (refDom) {
		let prevDom = null
		let currDom = refDom
		// 判断当前元素是否在 body 中，不在文档中则直接返回该节点
		if (!this.isInBody(currDom)) return currDom
		while (currDom) {
			if (prevDom) {
				let element = currDom.cloneNode(false)
				element.appendChild(prevDom)
				prevDom = element
			} else {
				prevDom = currDom.cloneNode(true)
			}
			currDom = currDom.parentElement
		}
	
		return prevDom
	},
    writeIframe: function (content) {
		var w, doc, iframe = document.createElement('iframe'),
			f = document.body.appendChild(iframe);
		iframe.id = "myIframe";
		//iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
		iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;');
		w = f.contentWindow || f.contentDocument;
		doc = f.contentDocument || f.contentWindow.document;
		doc.open();
		doc.write(content);
		doc.close();
		var _this = this
		iframe.onload = function(){
			_this.toPrint(w);
			setTimeout(function () {
			  	document.body.removeChild(iframe)
			}, 100)
		}
    },
    toPrint: function (frameWindow) {
		try {
			setTimeout(function () {
				frameWindow.focus();
				try {
					if (!frameWindow.document.execCommand('print', false, null)) {
						frameWindow.print();
					}
				} catch (e) {
					frameWindow.print();
				}
				frameWindow.close();
			}, 10);
		} catch (err) {
			console.log('err', err);
		}
    },
    // 检查一个元素是否是 body 元素的后代元素且非 body 元素本身
    isInBody: function (node) {
      	return (node === document.body) ? false : document.body.contains(node);
    },
    isDOM: (typeof HTMLElement === 'object') ?
	function (obj) {
		return obj instanceof HTMLElement;
	} :
	function (obj) {
		return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string';
	}
};
const PrintPlugin = {};
PrintPlugin.install = function(Vue, options) {
	Vue.prototype.$print = Print;
};
export default PrintPlugin;
